High Harmonic Generation in Ionization of Magnetically Dressed Atoms

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High Harmonic Generation in Ionization of
Magnetically Dressed Atoms
APS Centennial Meeting Atlanta 1999 DAMOP
Undergraduate Research Symposium

• Robert E. Wagner
• Freshman
• Intense Laser Physics Theory Unit
• Illinois State University

www.phy.ilstu.edu/ILP
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Acknowledgment

• Undergrad researchers
• P. Peverly, electron dynamics
• J. Braun, quantum simulations
• J. Csesznegi, graphics
• T. Shepherd, animations
• Advisors
• Profs. Q. Su, R. Grobe
• Support
• National Science Foundation
• Research Corporation
• ISU Honors Program

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Scattered Light Spectra in Ionization
w3
w2
wL
wL
w1
? ? ?
I(w)
w
wL
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Relativistic Newton Equations

• RK-4 variable step size simulation
• Spectra of scattered light

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Non-relativistic regime E lt 1 a.u.
? L ?L M ?a (L M odd)
? L ?L (L odd) Shifted atomic lines
Laser Intensity
w wL Rapid ionization
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Relativistic regime E gt 1 a.u.
? L ?L (L even odd)
Laser Intensity
Relativistic redshift
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Magnetically dressed atoms
Perturbative regime E lt 0.1 a.u.
Non-rel. strong field 0.1 lt E lt 1.0 a.u.
Laser Intensity
Relativistic magnetic resonances E gt 1.0 a.u.
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Non-rel. Perturbative Regime E lt 0.1
(3,1,1)
w L wL M w N w-
(L M N odd)
W Cyclotron frequency
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Analytically Soluble Model
analytical exact
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Relativistic Magnetic Resonances
Typical Orbit
Maximum displacement
How do the spectra evolve as a function of W?
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Summary
- W0 -gt main features understood - Analytical
model -gt retardation effects in spectra - Novel
rel. resonances enhance higher harmonics -
Challenges ahead coherence, quantum aspects...
R. E. Wagner, Q. Su and R. Grobe, Phys. Rev. A
(submitted)
www.phy.ilstu.edu/ILP